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Currently, Glass is not on general sale; it's only available through Google's Explorer programme. We have to assume that the DfT didn't gain access to the Explorer campaign for two simple reasons. One: it was only for US citizens. And two: $1,500 is a lot to pay for a concept device, which may have little bearing on a final product. Plus, the public sector is hardly flush with cash.

We did contact the DfT, asking whether any of its staff had indeed tried Glass, but we had received no reply by the time of publishing.

It does seem a little bizarre, therefore, that the DfT says it is "in discussion with the police to ensure that individuals do not use this technology while driving" before it has even tried the product.

But putting that aside, what's the case for and against Glass? Let's look at it in the eyes of the law first of all. The DfT's website states the following about hands-free devices: "You can use hands-free phones, sat navs and two-way radios when you're driving or riding." But the crux of the matter is what follows: "But if the police think you're distracted and not in control of your vehicle you could still get stopped and penalised."

So really, unless the DfT is really going to push through legislation banning wearable tech, it may just be down to interpretation.

The government's Think! road safety site states that crashes are four times more likely for drivers using their mobiles, with reaction times 50 percent slower. The Royal Society for the Prevention of Accidents says that drivers holding or using hands-free phones make numerous mistakes and makes it clear that it would prefer all devices, hands-free or otherwise, to be banned.

V3 readers seem to agree, too. Stupot commented: "Looking at a GPS display takes the driver's eyes off the road. This in itself is dangerous enough. How can computer displays do anything but add to the number of accidents on the roads?"

Meanwhile, Kemlyn_IT tweeted us, saying: "It's not about the technology, about the effect on driving. Some have been penalised for eating a sandwich for example."

So while there would seem to be absolute justification for the government to say that there is a potential problem, coming out and saying outright that they would look to ban the devices, despite hands-free phones and satnavs being legal, seems a little short-sighted and premature. We suggest Google sends the DfT a sample of the gadget before it proceeds any further.